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I just upgraded the front speakers to a set of Alpine 2-way 220w tweeter and speaker package. I would of went for the back but didn't see the point at the time. They sound very good for the price £50 ish. Sorry can't be any help with rears

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interestingly, i had a Tns 510 satnav unit that came with the car. changed it to a TNS 350 to have the benefit of speed camera and road speed alert. I have found the audio quality increase is significant giving a deeper bass response with depth and body and no mid range distortion. Just an observation.It may be that you want to change your speakers but don't hold your breath it may also be a product of the head unit quality